// @(#)CommandTask.java   1/2004
// Copyright (c) 1998-2004, Distributed Real-time Computing Lab (DRCL) 
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// modification, are permitted provided that the following conditions are met:
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//    this list of conditions and the following disclaimer. 
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package drcl.ruv;

import drcl.comp.*;

public class CommandTask extends drcl.DrclObj implements Runnable
{
  static final String INACTIVE = "INACTIVE";
  static final String IN_EXECUTION = "IN_EXECUTION";
  static final String DONE = "DONE";
  String cmd;
  Shell shell;
  drcl.comp.ACARuntime runtime;
  double period;
  boolean enabled = true;
  String state = INACTIVE;
  
  public static CommandTask add(String cmd_, double later_, double period_, drcl.comp.ACARuntime runtime_,
                  Shell shell_)
  {
    CommandTask ct_ = new CommandTask(); //(CommandTask) drcl.RecycleManager.reproduce(CommandTask.class);
    ct_.cmd = cmd_;
    ct_.period = period_;
    ct_.runtime = runtime_;
    ct_.shell = shell_;
    runtime_.addRunnable(later_, ct_);
    return ct_;
  }
  
  public static CommandTask addAt(String cmd_, double time_, double period_, drcl.comp.ACARuntime runtime_,
                  Shell shell_)
  {
    CommandTask ct_ = new CommandTask(); //(CommandTask) drcl.RecycleManager.reproduce(CommandTask.class);
    ct_.cmd = cmd_;
    ct_.period = period_;
    ct_.runtime = runtime_;
    ct_.shell = shell_;
    runtime_.addRunnableAt(time_, ct_);
    return ct_;
  }
  
  public void run()
  {
    //java.lang.System.out.println("--------CommandTask------");
    state = IN_EXECUTION;
    if (!enabled) return;
    try {
      //java.lang.System.out.println("---------------- Execute: " + cmd);
      synchronized (shell) {
        Object result_ = shell.eval(cmd);
        //java.lang.System.out.println("--------------- ENd execution");
        if (result_ != null) shell.print(result_.toString());
      }
      
      if (period > 0.0 && runtime != null) {
        runtime.addRunnable(period, this);
      }
    }
    catch (Exception e_) {
      e_.printStackTrace();
      String msg_ = "Script Error| " + e_ + "| executing '" + this;
      shell.println(msg_);
    }
    state = DONE;
  }
  
  public void setEnabled(boolean v_) { enabled = v_; }
  public boolean isEnabled() {return enabled; }

  public void stop()
  { enabled = false; }
  
  public String toString()
  {
    return state + ",script='" + cmd + "',period=" + period + ",shell=" + shell + ",enabled=" + enabled;
  }
  
  public String info()
  { return toString() + "\n"; }
}
